替换 notFoundHandler 设置

Question

我正在从 Slim/3 迁移到 Slim/4。我已经找到或想出替代我使用的所有功能的替代品，除了 404 Not Found Handler (part of the now gone App::$settings):

Slim App::$settings have been removed, multiple middleware have been implemented to replace the functionality from each individual settings.

notFoundHandler有中间件吗？如果没有，我该如何实现？

我的以前是这样的：

use Slim\Container;
$config = new Container(); 
$config['notFoundHandler'] = function (Container $c) {
    return function (Request $request, Response $response) use ($c): Response {
        $page = new Alvaro\Pages\Error($c);
        return $page->notFound404($request, $response);
    };
};

Answer 1

根据Slim 4 documentation on error handling

Each Slim Framework application has an error handler that receives all uncaught PHP exceptions

您可以设置自定义错误处理程序来处理抛出的每种类型的异常。预定义异常列表 classes 在同一页面上可用。

这是一个非常基本的示例，说明如何将闭包注册为错误处理程序，以仅处理 HttpNotFoundException 异常。您还可以将处理程序放在扩展 Slim\Handlers\ErrorHandler 的 class 中。另外，我实际上并没有使用你的 Alvaro\Pages\Error 来生成响应，但更改它应该很简单：

<?php

require '../vendor/autoload.php';

$app = Slim\Factory\AppFactory::create();

// Define Custom Error Handler
$customErrorHandler = function (
    Psr\Http\Message\ServerRequestInterface $request,
    \Throwable $exception,
    bool $displayErrorDetails,
    bool $logErrors,
    bool $logErrorDetails
) use ($app) {
    $response = $app->getResponseFactory()->createResponse();
    // seems the followin can be replaced by your custom response
    // $page = new Alvaro\Pages\Error($c);
    // return $page->notFound404($request, $response);
    $response->getBody()->write('not found');
    return $response->withStatus(404);
};

// Add Error Middleware
$errorMiddleware = $app->addErrorMiddleware(true, true, true);
// Register the handler to handle only  HttpNotFoundException
// Changing the first parameter registers the error handler for other types of exceptions
$errorMiddleware->setErrorHandler(Slim\Exception\HttpNotFoundException::class, $customErrorHandler);


$app->get('/', function ($request, $response) {
    $response->getBody()->write('Hello Slim 4');
    return $response;
});

$app->run();

另一种方法是创建一个通用错误处理程序并将其注册为默认处理程序，并在该处理程序内部根据抛出的异常类型决定应发送什么响应。类似于：

$customErrorHandler = function (
    Psr\Http\Message\ServerRequestInterface $request,
    \Throwable $exception,
    bool $displayErrorDetails,
    bool $logErrors,
    bool $logErrorDetails
) use ($app) {
    $response = $app->getResponseFactory()->createResponse();

        if ($exception instanceof HttpNotFoundException) {
            $message = 'not found';
            $code = 404;
        } elseif ($exception instanceof HttpMethodNotAllowedException) {
            $message = 'not allowed';
            $code = 403;
        }
        // ...other status codes, messages, or generally other responses for other types of exceptions

    $response->getBody()->write($message);
    return $response->withStatus($code);
};

然后您可以将其设置为默认错误处理程序：

$errorMiddleware = $app->addErrorMiddleware(true, true, true);
$errorMiddleware->setDefaultErrorHandler($customErrorHandler);

替换 notFoundHandler 设置

Replacement for notFoundHandler setting

php

slim

slim-4